SYNTHESIS, THERMAL TRANSFORMATIONS, AND MASS SPECTROMETRIC FRAGMENTATION OF 4,4'-[1,2-BIS(5-HYDROXY-3-METHYL-1-PHENYL-1<i>H</i>-PYRAZOL-4-YL)ETHANE-1,2-DIYL]-BIS(5-METHYL-2-PHENYL-1,2-DIHYDRO-3<i>H</i>-PYRAZOL-3-ONE)

Authors

  • Ю. А. Азев Ural Federal University named after the First President of Russia B. N. Yeltsin
  • И. С. Ковалев Ural Federal University named after the First President of Russia B. N. Yeltsin
  • А. В. Мехаев I. Ya. Postovskii Institute of Organic Synthesis, Ural Branch, the Russian Academy of Sciences
  • А. М. Гибор Ural Federal University named after the First President of Russia B. N. Yeltsin
  • В. И. Баранов Ural Federal University named after the First President of Russia B. N. Yeltsin
  • В. А. Бакулев Ural Federal University named after the First President of Russia B. N. Yeltsin
  • О. С. Ермакова Ural Federal University named after the First President of Russia B. N. Yeltsin

DOI:

https://doi.org/10.1007/551

Keywords:

3-methyl-1-phenylpyrazol-5-one, quinoxaline, tetrapyrazolylethane, thermogravimetry

Abstract

Quinoxaline reacted with 3-methyl-1-phenylpyrazol-5-one at room temperature in the presence of triethylamine in DMSO solution, to form 4,4'-[1,2-bis(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-ethane-1,2-diyl]bis(5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one). Heating of the obtained crystalline product at 240-250°C temperature led to the known 4-[(5-hydroxy-3-methyl-1-phenyl-1H‑pyrazol-4-yl)methylidene]-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one. The mass spectral fragmentation of the obtained compounds was characterized.

Authors: Yu. A. Azev, I. S. Kovalev, A. V. Mekhaev, A. M. Gibor, V. I. Baranov, V. A. Bakulev, and O. S. Ermakova

English Translation in Chemistry of Heterocyclic Compounds, 2013, 49 (4), pp 545-550

http://link.springer.com/article/10.1007/s10593-013-1280-7

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Published

2013-05-02

Issue

No. 4 (2013)

Section

Original Papers